MS21209F110L - Screw Threaded Insert by Helicoil Stanley Engineered Fastening

The Heli-Coil MS21209F110L is a high-performance, military-standard screw-locking wire thread insert designed to create wear-resistant, high-strength internal threads in light alloys and structural host materials. Precision-formed from cold-drawn 304 stainless steel wire with a distinctive diamond-shaped profile, this tanged insert features a series of straight chordal segments along its internal coils. These resilient flat segments flex outward as a male bolt enters, applying a constant, controlled prevailing torque that securely grips the fastener. The design delivers exceptional vibration resistance, preventing dangerous hardware backing-out under severe operational shock while protecting soft parent materials from internal thread stripping, galling, and erosion.

Internal Screw-Locking Profile Deformed chordal coils create continuous prevailing friction to lock mating fasteners tightly against heavy rotational vibration.

Standard Driving Tang Engineered with an integrated drive tang on the leading installation coil for positive, controlled tool engagement and exact depth placement.

Austenitic Stainless Steel Construction Formed from work-hardened corrosion-resistant steel to maximize tensile strength and shield delicate host materials from thread wear.

Dry Film Lubricant Coating Treated with a specialized dry lubricant finish to stabilize installation torque values, optimize seating pressure, and eliminate friction galling.